1// RUN: %clang_cc1 -std=c++98 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors -Wno-bind-to-temporary-copy
2// RUN: %clang_cc1 -std=c++11 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors -triple %itanium_abi_triple
3// RUN: %clang_cc1 -std=c++14 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors -triple %itanium_abi_triple
4// RUN: %clang_cc1 -std=c++1z %s -verify -fexceptions -fcxx-exceptions -pedantic-errors -triple %itanium_abi_triple
5
6namespace dr1 { // dr1: no
7  namespace X { extern "C" void dr1_f(int a = 1); }
8  namespace Y { extern "C" void dr1_f(int a = 1); }
9  using X::dr1_f; using Y::dr1_f;
10  void g() {
11    dr1_f(0);
12    // FIXME: This should be rejected, due to the ambiguous default argument.
13    dr1_f();
14  }
15  namespace X {
16    using Y::dr1_f;
17    void h() {
18      dr1_f(0);
19      // FIXME: This should be rejected, due to the ambiguous default argument.
20      dr1_f();
21    }
22  }
23
24  namespace X {
25    void z(int);
26  }
27  void X::z(int = 1) {} // expected-note {{previous}}
28  namespace X {
29    void z(int = 1); // expected-error {{redefinition of default argument}}
30  }
31
32  void i(int = 1);
33  void j() {
34    void i(int = 1);
35    using dr1::i;
36    i(0);
37    // FIXME: This should be rejected, due to the ambiguous default argument.
38    i();
39  }
40  void k() {
41    using dr1::i;
42    void i(int = 1);
43    i(0);
44    // FIXME: This should be rejected, due to the ambiguous default argument.
45    i();
46  }
47}
48
49namespace dr3 { // dr3: yes
50  template<typename T> struct A {};
51  template<typename T> void f(T) { A<T> a; } // expected-note {{implicit instantiation}}
52  template void f(int);
53  template<> struct A<int> {}; // expected-error {{explicit specialization of 'dr3::A<int>' after instantiation}}
54}
55
56namespace dr4 { // dr4: yes
57  extern "C" {
58    static void dr4_f(int) {}
59    static void dr4_f(float) {}
60    void dr4_g(int) {} // expected-note {{previous}}
61    void dr4_g(float) {} // expected-error {{conflicting types}}
62  }
63}
64
65namespace dr5 { // dr5: yes
66  struct A {} a;
67  struct B {
68    B(const A&);
69    B(const B&);
70  };
71  const volatile B b = a;
72
73  struct C { C(C&); };
74  struct D : C {};
75  struct E { operator D&(); } e;
76  const C c = e;
77}
78
79namespace dr7 { // dr7: yes
80  class A { public: ~A(); };
81  class B : virtual private A {}; // expected-note 2 {{declared private here}}
82  class C : public B {} c; // expected-error 2 {{inherited virtual base class 'dr7::A' has private destructor}} \
83                           // expected-note {{implicit default constructor for 'dr7::C' first required here}} \
84                           // expected-note {{implicit destructor for 'dr7::C' first required here}}
85  class VeryDerivedC : public B, virtual public A {} vdc;
86
87  class X { ~X(); }; // expected-note {{here}}
88  class Y : X { ~Y() {} }; // expected-error {{private destructor}}
89
90  namespace PR16370 { // This regressed the first time DR7 was fixed.
91    struct S1 { virtual ~S1(); };
92    struct S2 : S1 {};
93    struct S3 : S2 {};
94    struct S4 : virtual S2 {};
95    struct S5 : S3, S4 {
96      S5();
97      ~S5();
98    };
99    S5::S5() {}
100  }
101}
102
103namespace dr8 { // dr8: dup 45
104  class A {
105    struct U;
106    static const int k = 5;
107    void f();
108    template<typename, int, void (A::*)()> struct T;
109
110    T<U, k, &A::f> *g();
111  };
112  A::T<A::U, A::k, &A::f> *A::g() { return 0; }
113}
114
115namespace dr9 { // dr9: yes
116  struct B {
117  protected:
118    int m; // expected-note {{here}}
119    friend int R1();
120  };
121  struct N : protected B { // expected-note 2{{protected}}
122    friend int R2();
123  } n;
124  int R1() { return n.m; } // expected-error {{protected base class}} expected-error {{protected member}}
125  int R2() { return n.m; }
126}
127
128namespace dr10 { // dr10: dup 45
129  class A {
130    struct B {
131      A::B *p;
132    };
133  };
134}
135
136namespace dr11 { // dr11: yes
137  template<typename T> struct A : T {
138    using typename T::U;
139    U u;
140  };
141  template<typename T> struct B : T {
142    using T::V;
143    V v; // expected-error {{unknown type name}}
144  };
145  struct X { typedef int U; };
146  A<X> ax;
147}
148
149namespace dr12 { // dr12: sup 239
150  enum E { e };
151  E &f(E, E = e);
152  void g() {
153    int &f(int, E = e);
154    // Under DR12, these call two different functions.
155    // Under DR239, they call the same function.
156    int &b = f(e);
157    int &c = f(1);
158  }
159}
160
161namespace dr13 { // dr13: no
162  extern "C" void f(int);
163  void g(char);
164
165  template<typename T> struct A {
166    A(void (*fp)(T));
167  };
168  template<typename T> int h(void (T));
169
170  A<int> a1(f); // FIXME: We should reject this.
171  A<char> a2(g);
172  int a3 = h(f); // FIXME: We should reject this.
173  int a4 = h(g);
174}
175
176namespace dr14 { // dr14: yes
177  namespace X { extern "C" int dr14_f(); }
178  namespace Y { extern "C" int dr14_f(); }
179  using namespace X;
180  using namespace Y;
181  int k = dr14_f();
182
183  class C {
184    int k;
185    friend int Y::dr14_f();
186  } c;
187  namespace Z {
188    extern "C" int dr14_f() { return c.k; }
189  }
190
191  namespace X { typedef int T; typedef int U; } // expected-note {{candidate}}
192  namespace Y { typedef int T; typedef long U; } // expected-note {{candidate}}
193  T t; // ok, same type both times
194  U u; // expected-error {{ambiguous}}
195}
196
197namespace dr15 { // dr15: yes
198  template<typename T> void f(int); // expected-note {{previous}}
199  template<typename T> void f(int = 0); // expected-error {{default arguments cannot be added}}
200}
201
202namespace dr16 { // dr16: yes
203  class A { // expected-note {{here}}
204    void f(); // expected-note {{here}}
205    friend class C;
206  };
207  class B : A {}; // expected-note 4{{here}}
208  class C : B {
209    void g() {
210      f(); // expected-error {{private member}} expected-error {{private base}}
211      A::f(); // expected-error {{private member}} expected-error {{private base}}
212    }
213  };
214}
215
216namespace dr17 { // dr17: yes
217  class A {
218    int n;
219    int f();
220    struct C;
221  };
222  struct B : A {} b;
223  int A::f() { return b.n; }
224  struct A::C : A {
225    int g() { return n; }
226  };
227}
228
229// dr18: sup 577
230
231namespace dr19 { // dr19: yes
232  struct A {
233    int n; // expected-note {{here}}
234  };
235  struct B : protected A { // expected-note {{here}}
236  };
237  struct C : B {} c;
238  struct D : B {
239    int get1() { return c.n; } // expected-error {{protected member}}
240    int get2() { return ((A&)c).n; } // ok, A is an accessible base of B from here
241  };
242}
243
244namespace dr20 { // dr20: yes
245  class X {
246  public:
247    X();
248  private:
249    X(const X&); // expected-note {{here}}
250  };
251  X f();
252  X x = f(); // expected-error {{private}}
253}
254
255namespace dr21 { // dr21: yes
256  template<typename T> struct A;
257  struct X {
258    template<typename T = int> friend struct A; // expected-error {{default template argument not permitted on a friend template}}
259    template<typename T = int> friend struct B; // expected-error {{default template argument not permitted on a friend template}}
260  };
261}
262
263namespace dr22 { // dr22: sup 481
264  template<typename dr22_T = dr22_T> struct X; // expected-error {{unknown type name 'dr22_T'}}
265  typedef int T;
266  template<typename T = T> struct Y;
267}
268
269namespace dr23 { // dr23: yes
270  template<typename T> void f(T, T); // expected-note {{candidate}}
271  template<typename T> void f(T, int); // expected-note {{candidate}}
272  void g() { f(0, 0); } // expected-error {{ambiguous}}
273}
274
275// dr24: na
276
277namespace dr25 { // dr25: yes
278  struct A {
279    void f() throw(int);
280  };
281  void (A::*f)() throw (int);
282  void (A::*g)() throw () = f; // expected-error {{is not superset of source}}
283  void (A::*g2)() throw () = 0;
284  void (A::*h)() throw (int, char) = f;
285  void (A::*i)() throw () = &A::f; // expected-error {{is not superset of source}}
286  void (A::*i2)() throw () = 0;
287  void (A::*j)() throw (int, char) = &A::f;
288  void x() {
289    // FIXME: Don't produce the second error here.
290    g2 = f; // expected-error {{is not superset}} expected-error {{incompatible}}
291    h = f;
292    i2 = &A::f; // expected-error {{is not superset}} expected-error {{incompatible}}
293    j = &A::f;
294  }
295}
296
297namespace dr26 { // dr26: yes
298  struct A { A(A, const A & = A()); }; // expected-error {{must pass its first argument by reference}}
299  struct B {
300    B(); // expected-note {{candidate}}
301    B(const B &, B = B()); // expected-error {{no matching constructor}} expected-note {{candidate}} expected-note {{here}}
302  };
303}
304
305namespace dr27 { // dr27: yes
306  enum E { e } n;
307  E &m = true ? n : n;
308}
309
310// dr28: na
311
312namespace dr29 { // dr29: 3.4
313  void dr29_f0(); // expected-note {{here}}
314  void g0() { void dr29_f0(); }
315  extern "C++" void g0_cxx() { void dr29_f0(); }
316  extern "C" void g0_c() { void dr29_f0(); } // expected-error {{different language linkage}}
317
318  extern "C" void dr29_f1(); // expected-note {{here}}
319  void g1() { void dr29_f1(); }
320  extern "C" void g1_c() { void dr29_f1(); }
321  extern "C++" void g1_cxx() { void dr29_f1(); } // expected-error {{different language linkage}}
322
323  void g2() { void dr29_f2(); } // expected-note {{here}}
324  extern "C" void dr29_f2(); // expected-error {{different language linkage}}
325
326  extern "C" void g3() { void dr29_f3(); } // expected-note {{here}}
327  extern "C++" void dr29_f3(); // expected-error {{different language linkage}}
328
329  extern "C++" void g4() { void dr29_f4(); } // expected-note {{here}}
330  extern "C" void dr29_f4(); // expected-error {{different language linkage}}
331
332  extern "C" void g5();
333  extern "C++" void dr29_f5();
334  void g5() {
335    void dr29_f5(); // ok, g5 is extern "C" but we're not inside the linkage-specification here.
336  }
337
338  extern "C++" void g6();
339  extern "C" void dr29_f6();
340  void g6() {
341    void dr29_f6(); // ok, g6 is extern "C" but we're not inside the linkage-specification here.
342  }
343
344  extern "C" void g7();
345  extern "C++" void dr29_f7(); // expected-note {{here}}
346  extern "C" void g7() {
347    void dr29_f7(); // expected-error {{different language linkage}}
348  }
349
350  extern "C++" void g8();
351  extern "C" void dr29_f8(); // expected-note {{here}}
352  extern "C++" void g8() {
353    void dr29_f8(); // expected-error {{different language linkage}}
354  }
355}
356
357namespace dr30 { // dr30: sup 468 c++11
358  struct A {
359    template<int> static int f();
360  } a, *p = &a;
361  int x = A::template f<0>();
362  int y = a.template f<0>();
363  int z = p->template f<0>();
364#if __cplusplus < 201103L
365  // FIXME: It's not clear whether DR468 applies to C++98 too.
366  // expected-error@-5 {{'template' keyword outside of a template}}
367  // expected-error@-5 {{'template' keyword outside of a template}}
368  // expected-error@-5 {{'template' keyword outside of a template}}
369#endif
370}
371
372namespace dr31 { // dr31: yes
373  class X {
374  private:
375    void operator delete(void*); // expected-note {{here}}
376  };
377  // We would call X::operator delete if X() threw (even though it can't,
378  // and even though we allocated the X using ::operator delete).
379  X *p = new X; // expected-error {{private}}
380}
381
382// dr32: na
383
384namespace dr33 { // dr33: yes
385  namespace X { struct S; void f(void (*)(S)); } // expected-note {{candidate}}
386  namespace Y { struct T; void f(void (*)(T)); } // expected-note {{candidate}}
387  void g(X::S);
388  template<typename Z> Z g(Y::T);
389  void h() { f(&g); } // expected-error {{ambiguous}}
390}
391
392// dr34: na
393// dr35: dup 178
394// dr37: sup 475
395
396namespace dr38 { // dr38: yes
397  template<typename T> struct X {};
398  template<typename T> X<T> operator+(X<T> a, X<T> b) { return a; }
399  template X<int> operator+<int>(X<int>, X<int>);
400}
401
402namespace dr39 { // dr39: no
403  namespace example1 {
404    struct A { int &f(int); };
405    struct B : A {
406      using A::f;
407      float &f(float);
408    } b;
409    int &r = b.f(0);
410  }
411
412  namespace example2 {
413    struct A {
414      int &x(int); // expected-note {{found}}
415      static int &y(int); // expected-note {{found}}
416    };
417    struct V {
418      int &z(int);
419    };
420    struct B : A, virtual V {
421      using A::x; // expected-note {{found}}
422      float &x(float);
423      using A::y; // expected-note {{found}}
424      static float &y(float);
425      using V::z;
426      float &z(float);
427    };
428    struct C : A, B, virtual V {} c; // expected-warning {{direct base 'dr39::example2::A' is inaccessible due to ambiguity:\n    struct dr39::example2::C -> struct dr39::example2::A\n    struct dr39::example2::C -> struct dr39::example2::B -> struct dr39::example2::A}}
429    int &x = c.x(0); // expected-error {{found in multiple base classes}}
430    // FIXME: This is valid, because we find the same static data member either way.
431    int &y = c.y(0); // expected-error {{found in multiple base classes}}
432    int &z = c.z(0);
433  }
434
435  namespace example3 {
436    struct A { static int f(); };
437    struct B : virtual A { using A::f; };
438    struct C : virtual A { using A::f; };
439    struct D : B, C {} d;
440    int k = d.f();
441  }
442
443  namespace example4 {
444    struct A { int n; }; // expected-note {{found}}
445    struct B : A {};
446    struct C : A {};
447    struct D : B, C { int f() { return n; } }; // expected-error {{found in multiple base-class}}
448  }
449
450  namespace PR5916 {
451    // FIXME: This is valid.
452    struct A { int n; }; // expected-note +{{found}}
453    struct B : A {};
454    struct C : A {};
455    struct D : B, C {};
456    int k = sizeof(D::n); // expected-error {{found in multiple base}} expected-error {{unknown type name}}
457#if __cplusplus >= 201103L
458    decltype(D::n) n; // expected-error {{found in multiple base}}
459#endif
460  }
461}
462
463// dr40: na
464
465namespace dr41 { // dr41: yes
466  struct S f(S);
467}
468
469namespace dr42 { // dr42: yes
470  struct A { static const int k = 0; };
471  struct B : A { static const int k = A::k; };
472}
473
474// dr43: na
475
476namespace dr44 { // dr44: yes
477  struct A {
478    template<int> void f();
479    template<> void f<0>(); // expected-error {{explicit specialization of 'f' in class scope}}
480  };
481}
482
483namespace dr45 { // dr45: yes
484  class A {
485    class B {};
486    class C : B {};
487    C c;
488  };
489}
490
491namespace dr46 { // dr46: yes
492  template<typename> struct A { template<typename> struct B {}; };
493  template template struct A<int>::B<int>; // expected-error {{expected unqualified-id}}
494}
495
496namespace dr47 { // dr47: sup 329
497  template<typename T> struct A {
498    friend void f() { T t; } // expected-error {{redefinition}} expected-note {{previous}}
499  };
500  A<int> a;
501  A<float> b; // expected-note {{instantiation of}}
502
503  void f();
504  void g() { f(); }
505}
506
507namespace dr48 { // dr48: yes
508  namespace {
509    struct S {
510      static const int m = 0;
511      static const int n = 0;
512      static const int o = 0;
513    };
514  }
515  int a = S::m;
516  // FIXME: We should produce a 'has internal linkage but is not defined'
517  // diagnostic for 'S::n'.
518  const int &b = S::n;
519  const int S::o;
520  const int &c = S::o;
521}
522
523namespace dr49 { // dr49: yes
524  template<int*> struct A {}; // expected-note 0-2{{here}}
525  int k;
526#if __has_feature(cxx_constexpr)
527  constexpr
528#endif
529  int *const p = &k; // expected-note 0-2{{here}}
530  A<&k> a;
531  A<p> b;
532#if __cplusplus <= 201402L
533  // expected-error@-2 {{must have its address taken}}
534#endif
535#if __cplusplus < 201103L
536  // expected-error@-5 {{internal linkage}}
537#endif
538  int *q = &k;
539  A<q> c;
540#if __cplusplus < 201103L
541  // expected-error@-2 {{must have its address taken}}
542#else
543  // expected-error@-4 {{constant expression}}
544  // expected-note@-5 {{read of non-constexpr}}
545  // expected-note@-7 {{declared here}}
546#endif
547}
548
549namespace dr50 { // dr50: yes
550  struct X; // expected-note {{forward}}
551  extern X *p;
552  X *q = (X*)p;
553  X *r = static_cast<X*>(p);
554  X *s = const_cast<X*>(p);
555  X *t = reinterpret_cast<X*>(p);
556  X *u = dynamic_cast<X*>(p); // expected-error {{incomplete}}
557}
558
559namespace dr51 { // dr51: yes
560  struct A {};
561  struct B : A {};
562  struct S {
563    operator A&();
564    operator B&();
565  } s;
566  A &a = s;
567}
568
569namespace dr52 { // dr52: yes
570  struct A { int n; }; // expected-note {{here}}
571  struct B : private A {} b; // expected-note 2{{private}}
572  // FIXME: This first diagnostic is very strangely worded, and seems to be bogus.
573  int k = b.A::n; // expected-error {{'A' is a private member of 'dr52::A'}}
574  // expected-error@-1 {{cannot cast 'struct B' to its private base}}
575}
576
577namespace dr53 { // dr53: yes
578  int n = 0;
579  enum E { e } x = static_cast<E>(n);
580}
581
582namespace dr54 { // dr54: yes
583  struct A { int a; } a;
584  struct V { int v; } v;
585  struct B : private A, virtual V { int b; } b; // expected-note 6{{private here}}
586
587  A &sab = static_cast<A&>(b); // expected-error {{private base}}
588  A *spab = static_cast<A*>(&b); // expected-error {{private base}}
589  int A::*smab = static_cast<int A::*>(&B::b); // expected-error {{private base}}
590  B &sba = static_cast<B&>(a); // expected-error {{private base}}
591  B *spba = static_cast<B*>(&a); // expected-error {{private base}}
592  int B::*smba = static_cast<int B::*>(&A::a); // expected-error {{private base}}
593
594  V &svb = static_cast<V&>(b);
595  V *spvb = static_cast<V*>(&b);
596  int V::*smvb = static_cast<int V::*>(&B::b); // expected-error {{virtual base}}
597  B &sbv = static_cast<B&>(v); // expected-error {{virtual base}}
598  B *spbv = static_cast<B*>(&v); // expected-error {{virtual base}}
599  int B::*smbv = static_cast<int B::*>(&V::v); // expected-error {{virtual base}}
600
601  A &cab = (A&)(b);
602  A *cpab = (A*)(&b);
603  int A::*cmab = (int A::*)(&B::b);
604  B &cba = (B&)(a);
605  B *cpba = (B*)(&a);
606  int B::*cmba = (int B::*)(&A::a);
607
608  V &cvb = (V&)(b);
609  V *cpvb = (V*)(&b);
610  int V::*cmvb = (int V::*)(&B::b); // expected-error {{virtual base}}
611  B &cbv = (B&)(v); // expected-error {{virtual base}}
612  B *cpbv = (B*)(&v); // expected-error {{virtual base}}
613  int B::*cmbv = (int B::*)(&V::v); // expected-error {{virtual base}}
614}
615
616namespace dr55 { // dr55: yes
617  enum E { e = 5 };
618  int test[(e + 1 == 6) ? 1 : -1];
619}
620
621namespace dr56 { // dr56: yes
622  struct A {
623    typedef int T; // expected-note {{previous}}
624    typedef int T; // expected-error {{redefinition}}
625  };
626  struct B {
627    struct X;
628    typedef X X; // expected-note {{previous}}
629    typedef X X; // expected-error {{redefinition}}
630  };
631}
632
633namespace dr58 { // dr58: yes
634  // FIXME: Ideally, we should have a CodeGen test for this.
635#if __cplusplus >= 201103L
636  enum E1 { E1_0 = 0, E1_1 = 1 };
637  enum E2 { E2_0 = 0, E2_m1 = -1 };
638  struct X { E1 e1 : 1; E2 e2 : 1; };
639  static_assert(X{E1_1, E2_m1}.e1 == 1, "");
640  static_assert(X{E1_1, E2_m1}.e2 == -1, "");
641#endif
642}
643
644namespace dr59 { // dr59: yes
645  template<typename T> struct convert_to { operator T() const; };
646  struct A {}; // expected-note 2{{volatile qualifier}}
647  struct B : A {}; // expected-note 2{{volatile qualifier}}
648#if __cplusplus >= 201103L // move constructors
649  // expected-note@-3 2{{volatile qualifier}}
650  // expected-note@-3 2{{volatile qualifier}}
651#endif
652
653  A a1 = convert_to<A>();
654  A a2 = convert_to<A&>();
655  A a3 = convert_to<const A>();
656  A a4 = convert_to<const volatile A>(); // expected-error {{no viable}}
657  A a5 = convert_to<const volatile A&>(); // expected-error {{no viable}}
658
659  B b1 = convert_to<B>();
660  B b2 = convert_to<B&>();
661  B b3 = convert_to<const B>();
662  B b4 = convert_to<const volatile B>(); // expected-error {{no viable}}
663  B b5 = convert_to<const volatile B&>(); // expected-error {{no viable}}
664
665  int n1 = convert_to<int>();
666  int n2 = convert_to<int&>();
667  int n3 = convert_to<const int>();
668  int n4 = convert_to<const volatile int>();
669  int n5 = convert_to<const volatile int&>();
670}
671
672namespace dr60 { // dr60: yes
673  void f(int &);
674  int &f(...);
675  const int k = 0;
676  int &n = f(k);
677}
678
679namespace dr61 { // dr61: yes
680  struct X {
681    static void f();
682  } x;
683  struct Y {
684    static void f();
685    static void f(int);
686  } y;
687  // This is (presumably) valid, because x.f does not refer to an overloaded
688  // function name.
689  void (*p)() = &x.f;
690  void (*q)() = &y.f; // expected-error {{cannot create a non-constant pointer to member function}}
691  void (*r)() = y.f; // expected-error {{cannot create a non-constant pointer to member function}}
692}
693
694namespace dr62 { // dr62: yes
695  struct A {
696    struct { int n; } b;
697  };
698  template<typename T> struct X {};
699  template<typename T> T get() { return get<T>(); }
700  template<typename T> int take(T) { return 0; }
701
702  X<A> x1;
703  A a = get<A>();
704
705  typedef struct { } *NoNameForLinkagePtr;
706#if __cplusplus < 201103L
707  // expected-note@-2 5{{here}}
708#endif
709  NoNameForLinkagePtr noNameForLinkagePtr;
710
711  struct Danger {
712    NoNameForLinkagePtr p;
713  };
714
715  X<NoNameForLinkagePtr> x2;
716  X<const NoNameForLinkagePtr> x3;
717  NoNameForLinkagePtr p1 = get<NoNameForLinkagePtr>();
718  NoNameForLinkagePtr p2 = get<const NoNameForLinkagePtr>();
719  int n1 = take(noNameForLinkagePtr);
720#if __cplusplus < 201103L
721  // expected-error@-6 {{uses unnamed type}}
722  // expected-error@-6 {{uses unnamed type}}
723  // expected-error@-6 {{uses unnamed type}}
724  // expected-error@-6 {{uses unnamed type}}
725  // expected-error@-6 {{uses unnamed type}}
726#endif
727
728  X<Danger> x4;
729
730  void f() {
731    struct NoLinkage {};
732    X<NoLinkage> a;
733    X<const NoLinkage> b;
734    get<NoLinkage>();
735    get<const NoLinkage>();
736    X<void (*)(NoLinkage A::*)> c;
737    X<int NoLinkage::*> d;
738#if __cplusplus < 201103L
739  // expected-error@-7 {{uses local type}}
740  // expected-error@-7 {{uses local type}}
741  // expected-error@-7 {{uses local type}}
742  // expected-error@-7 {{uses local type}}
743  // expected-error@-7 {{uses local type}}
744  // expected-error@-7 {{uses local type}}
745#endif
746  }
747}
748
749namespace dr63 { // dr63: yes
750  template<typename T> struct S { typename T::error e; };
751  extern S<int> *p;
752  void *q = p;
753}
754
755namespace dr64 { // dr64: yes
756  template<class T> void f(T);
757  template<class T> void f(T*);
758  template<> void f(int*);
759  template<> void f<int>(int*);
760  template<> void f(int);
761}
762
763// dr65: na
764
765namespace dr66 { // dr66: no
766  namespace X {
767    int f(int n); // expected-note 2{{candidate}}
768  }
769  using X::f;
770  namespace X {
771    int f(int n = 0);
772    int f(int, int);
773  }
774  // FIXME: The first two calls here should be accepted.
775  int a = f(); // expected-error {{no matching function}}
776  int b = f(1);
777  int c = f(1, 2); // expected-error {{no matching function}}
778}
779
780// dr67: na
781
782namespace dr68 { // dr68: yes
783  template<typename T> struct X {};
784  struct ::dr68::X<int> x1;
785  struct ::dr68::template X<int> x2;
786#if __cplusplus < 201103L
787  // expected-error@-2 {{'template' keyword outside of a template}}
788#endif
789  struct Y {
790    friend struct X<int>;
791    friend struct ::dr68::X<char>;
792    friend struct ::dr68::template X<double>;
793#if __cplusplus < 201103L
794  // expected-error@-2 {{'template' keyword outside of a template}}
795#endif
796  };
797  template<typename>
798  struct Z {
799    friend struct ::dr68::template X<double>;
800    friend typename ::dr68::X<double>;
801#if __cplusplus < 201103L
802  // expected-error@-2 {{C++11 extension}}
803#endif
804  };
805}
806
807namespace dr69 { // dr69: yes
808  template<typename T> static void f() {}
809  // FIXME: Should we warn here?
810  inline void g() { f<int>(); }
811  // FIXME: This should be rejected, per [temp.explicit]p11.
812  extern template void f<char>();
813#if __cplusplus < 201103L
814  // expected-error@-2 {{C++11 extension}}
815#endif
816  template<void(*)()> struct Q {};
817  Q<&f<int> > q;
818#if __cplusplus < 201103L
819  // expected-error@-2 {{internal linkage}} expected-note@-11 {{here}}
820#endif
821}
822
823namespace dr70 { // dr70: yes
824  template<int> struct A {};
825  template<int I, int J> int f(int (&)[I + J], A<I>, A<J>);
826  int arr[7];
827  int k = f(arr, A<3>(), A<4>());
828}
829
830// dr71: na
831// dr72: dup 69
832
833#if __cplusplus >= 201103L
834namespace dr73 { // dr73: no
835  // The resolution to dr73 is unworkable. Consider:
836  int a, b;
837  static_assert(&a + 1 != &b, ""); // expected-error {{not an integral constant expression}}
838}
839#endif
840
841namespace dr74 { // dr74: yes
842  enum E { k = 5 };
843  int (*p)[k] = new int[k][k];
844}
845
846namespace dr75 { // dr75: yes
847  struct S {
848    static int n = 0; // expected-error {{non-const}}
849  };
850}
851
852namespace dr76 { // dr76: yes
853  const volatile int n = 1;
854  int arr[n]; // expected-error +{{variable length array}}
855}
856
857namespace dr77 { // dr77: yes
858  struct A {
859    struct B {};
860    friend struct B;
861  };
862}
863
864namespace dr78 { // dr78: sup ????
865  // Under DR78, this is valid, because 'k' has static storage duration, so is
866  // zero-initialized.
867  const int k; // expected-error {{default initialization of an object of const}}
868}
869
870// dr79: na
871
872namespace dr80 { // dr80: yes
873  struct A {
874    int A;
875  };
876  struct B {
877    static int B; // expected-error {{same name as its class}}
878  };
879  struct C {
880    int C; // expected-note {{hidden by}}
881    // FIXME: These diagnostics aren't very good.
882    C(); // expected-error {{must use 'struct' tag to refer to}} expected-error {{expected member name}}
883  };
884  struct D {
885    D();
886    int D; // expected-error {{same name as its class}}
887  };
888}
889
890// dr81: na
891// dr82: dup 48
892
893namespace dr83 { // dr83: yes
894  int &f(const char*);
895  char &f(char *);
896  int &k = f("foo");
897}
898
899namespace dr84 { // dr84: yes
900  struct B;
901  struct A { operator B() const; };
902  struct C {};
903  struct B {
904    B(B&); // expected-note {{candidate}}
905    B(C);
906    operator C() const;
907  };
908  A a;
909  // Cannot use B(C) / operator C() pair to construct the B from the B temporary
910  // here.
911  B b = a; // expected-error {{no viable}}
912}
913
914namespace dr85 { // dr85: yes
915  struct A {
916    struct B;
917    struct B {}; // expected-note{{previous declaration is here}}
918    struct B; // expected-error{{class member cannot be redeclared}}
919
920    union U;
921    union U {}; // expected-note{{previous declaration is here}}
922    union U; // expected-error{{class member cannot be redeclared}}
923
924#if __cplusplus >= 201103L
925    enum E1 : int;
926    enum E1 : int { e1 }; // expected-note{{previous declaration is here}}
927    enum E1 : int; // expected-error{{class member cannot be redeclared}}
928
929    enum class E2;
930    enum class E2 { e2 }; // expected-note{{previous declaration is here}}
931    enum class E2; // expected-error{{class member cannot be redeclared}}
932#endif
933  };
934
935  template <typename T>
936  struct C {
937    struct B {}; // expected-note{{previous declaration is here}}
938    struct B; // expected-error{{class member cannot be redeclared}}
939  };
940}
941
942// dr86: dup 446
943
944namespace dr87 { // dr87: no
945  template<typename T> struct X {};
946  // FIXME: This is invalid.
947  X<void() throw()> x;
948  // ... but this is valid.
949  X<void(void() throw())> y;
950}
951
952namespace dr88 { // dr88: yes
953  template<typename T> struct S {
954    static const int a = 1; // expected-note {{previous}}
955    static const int b;
956  };
957  template<> const int S<int>::a = 4; // expected-error {{already has an initializer}}
958  template<> const int S<int>::b = 4;
959}
960
961// dr89: na
962
963namespace dr90 { // dr90: yes
964  struct A {
965    template<typename T> friend void dr90_f(T);
966  };
967  struct B : A {
968    template<typename T> friend void dr90_g(T);
969    struct C {};
970    union D {};
971  };
972  struct E : B {};
973  struct F : B::C {};
974
975  void test() {
976    dr90_f(A());
977    dr90_f(B());
978    dr90_f(B::C()); // expected-error {{undeclared identifier}}
979    dr90_f(B::D()); // expected-error {{undeclared identifier}}
980    dr90_f(E());
981    dr90_f(F()); // expected-error {{undeclared identifier}}
982
983    dr90_g(A()); // expected-error {{undeclared identifier}}
984    dr90_g(B());
985    dr90_g(B::C());
986    dr90_g(B::D());
987    dr90_g(E());
988    dr90_g(F()); // expected-error {{undeclared identifier}}
989  }
990}
991
992namespace dr91 { // dr91: yes
993  union U { friend int f(U); };
994  int k = f(U());
995}
996
997namespace dr92 { // FIXME: Issue is still open.
998  void f() throw(int, float);
999  void (*p)() throw(int) = &f; // expected-error {{target exception specification is not superset of source}}
1000  void (*q)() throw(int);
1001  void (**pp)() throw() = &q; // expected-error {{exception specifications are not allowed}}
1002
1003  void g(void() throw());
1004  void h() {
1005    g(f); // expected-error {{is not superset}}
1006    g(q); // expected-error {{is not superset}}
1007  }
1008
1009  // Prior to C++17, this is OK because the exception specification is not
1010  // considered in this context. In C++17, we *do* perform an implicit
1011  // conversion (which performs initialization), but we convert to the type of
1012  // the template parameter, which does not include the exception specification.
1013  template<void() throw()> struct X {};
1014  X<&f> xp; // ok
1015}
1016
1017// dr93: na
1018
1019namespace dr94 { // dr94: yes
1020  struct A { static const int n = 5; };
1021  int arr[A::n];
1022}
1023
1024namespace dr95 { // dr95: yes
1025  struct A;
1026  struct B;
1027  namespace N {
1028    class C {
1029      friend struct A;
1030      friend struct B;
1031      static void f(); // expected-note {{here}}
1032    };
1033    struct A *p; // dr95::A, not dr95::N::A.
1034  }
1035  A *q = N::p; // ok, same type
1036  struct B { void f() { N::C::f(); } }; // expected-error {{private}}
1037}
1038
1039namespace dr96 { // dr96: no
1040  struct A {
1041    void f(int);
1042    template<typename T> int f(T);
1043    template<typename T> struct S {};
1044  } a;
1045  template<template<typename> class X> struct B {};
1046
1047  template<typename T>
1048  void test() {
1049    int k1 = a.template f<int>(0);
1050    // FIXME: This is ill-formed, because 'f' is not a template-id and does not
1051    // name a class template.
1052    // FIXME: What about alias templates?
1053    int k2 = a.template f(1);
1054    A::template S<int> s;
1055    B<A::template S> b;
1056  }
1057}
1058
1059namespace dr97 { // dr97: yes
1060  struct A {
1061    static const int a = false;
1062    static const int b = !a;
1063  };
1064}
1065
1066namespace dr98 { // dr98: yes
1067  void test(int n) {
1068    switch (n) {
1069      try { // expected-note 2{{bypasses}}
1070        case 0: // expected-error {{cannot jump}}
1071        x:
1072          throw n;
1073      } catch (...) { // expected-note 2{{bypasses}}
1074        case 1: // expected-error {{cannot jump}}
1075        y:
1076          throw n;
1077      }
1078      case 2:
1079        goto x; // expected-error {{cannot jump}}
1080      case 3:
1081        goto y; // expected-error {{cannot jump}}
1082    }
1083  }
1084}
1085
1086namespace dr99 { // dr99: sup 214
1087  template<typename T> void f(T&);
1088  template<typename T> int &f(const T&);
1089  const int n = 0;
1090  int &r = f(n);
1091}
1092